JP2010119379A - Mowing blade for bush cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient and economical mowing blade having a long service life, because pervasive blades in current community as steel circular saw blades as the mowing blade of weed mowers are short in service life due to damage caused by stones and concrete and nonrepairable and ones utilizing a chemical fiber are dull. <P>SOLUTION: The problem that hard metal blades are rather easily broken by stones and concrete and unpraiseworthy, chemical fiber blades are inefficient, but nevertheless the blades capable of efficiently cutting and corresponding to stones and concrete are elastic hard metal wires, is solved by materializing the system using the elastic hard metal wires. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

Field of Invention

  The present invention relates to a mowing blade for a brush cutter used when cutting weeds and the like.

Conventionally, this type of mowing blade is provided with a plurality of cutting blades on the outer peripheral edge of a base formed in a circular shape with a hard metal plate. And so on.
The cutting shape of conventional cutting blades has a good cutting performance, but there is a phenomenon that weeds are involved in the rotating shaft, and there is a fault that stops the rotation, and the cutting edge is damaged by stone or concrete. As a countermeasure for the above-mentioned countermeasures that often break and become unusable, a method of rotating a flexible fiber material made of chemical fiber at high speed has been developed in recent years.

  Conventional mowing blades for brush cutters were designed to pull the weeds at an angle of the cutting blade in order to improve cutting performance. Therefore, the weed cutting performance is good. In many cases, weeds are wound around a rotating shaft to stop the rotation, and this preventive measure is demanded. Also, the cutting blade is often damaged by stone, concrete, etc., and if the cutting performance deteriorates due to damage, it will be discarded, and in order to solve the above problem, which is uneconomical, with chemical fiber in recent years A material that cuts weeds with the wire material made has been developed, but its cutting performance is low and has not been solved.

The present invention has been made to solve the above-mentioned problems, and cannot be solved by a method using a cutting blade provided on the periphery of a circular metal plate that has been widely used in the past. It solves with the method by the line material which is.
Because chemical fibers are flexible, they have a short service life and inferior cutting performance. Therefore, the present invention uses a hard metal wire, for example, a steel wire, a stainless steel wire, a titanium wire, etc., and uses the elasticity of this wire. Even if it hits stone, concrete, etc., it is hardly damaged.
The hard metal wire is of a material having elasticity, but if it is made into a spring shape or a plate shape, more flexible elasticity can be obtained, so that the cutting blade of the present invention forms the lower portion in a spring shape.
The present invention is not provided with a cutting blade on the periphery of a conventional circular metal plate, but with a plurality of hard metal wires radially provided on the week edge of the disk, and this metal wire is rotated at high speed as a cutting blade. It is a feature of the present invention to cut weeds.
The conventional cutting blade is damaged when it hits stone or concrete, but since the present invention becomes a hard metal wire, it is bent and not damaged due to elasticity. This property has a very long service life and is the maximum advantage of the present invention. .
The length of the radial hard metal wire is 50 to 200 mm, and the wire diameter is 0.2 to 3 mm. The number is 1 to 50.
In the present invention, a hard metal wire is provided radially on the periphery of a disk-shaped substrate. The specifications of the metal wire are determined with reference to the material, hardness, type of cut, etc. of the metal wire. Of course.
Since the metal wire which is the cutting blade of the present invention has a structure that can be easily and easily attached and detached, it is very easy to replace the metal wire and change the number. This is also a major feature of the present invention.

The conventional circular steel plate mowing blade is damaged when it hits stone or concrete, so it has a short life and cannot be repaired.
The mowing blade of the present invention is an economical mowing blade that can be used permanently because the cutting blade can be replaced inexpensively, easily and quickly.
Since the cutting blade of the present invention is a hard metal wire, the impact of impact on stones and concrete is avoided as much as possible by utilizing the characteristic of being bent by elasticity. Therefore, the life of the cutting blade of the present invention is extremely long. In addition, this cutting blade has a great advantage that it is inexpensive.

A drive shaft connecting portion is provided in the center of the disc-shaped base, and a plurality of cutting blades are provided at equal intervals radially from the peripheral edge of the base.
The lower end of the cutting blade is formed into a circular shape, and a mounting portion is provided, and a spring portion is provided on the upper portion of the mounting portion. The mounting portion and the spring portion are accommodated in the base, and a plurality of linear portions are arranged radially outside the base. The configuration that comes out in is provided as the best mowing blade. .

The cutting blades of circular steel plates that have been widely used nowadays are damaged by stones and concrete and cannot be regenerated, so they are no longer evaluated and no longer qualify as cutting blades. In recent years, a method of cutting weeds with chemical fiber wires has been developed, but even if it hits stone or concrete, it does not break, so it is a flexible blade and cuts the weeds that are the original purpose The performance of the present invention is low, and the object of the present invention is to realize a mowing blade that is tough against stones and concrete and has excellent cutting properties against weeds. FIG. 1] is a plan view of a cutting blade 1 of a mowing blade for a brush cutter according to the present invention, and this cutting blade 1 is made of a hard metal wire. For example, steel wire, stainless steel wire, titanium wire, To use.
Since the object of the present invention is cutting weeds, a sharp cutting edge is not required, and a grass cutting blade capable of dealing with stone and concrete is required. The cutting blade 1 of the present invention has been made to meet this requirement. The cutting blade 1 is composed of a blade portion 2, a spring portion 3, and an attachment portion 4, and the blade portion 2 is a simple round bar-like straight line with a wire diameter of 0.2 mm to 3,0 mm. The cutting blade 1 is rotated at a high speed and the weeds are cut by the rotational force. However, the cutting performance is improved by changing the blade portion 2 to a curve rather than a straight line, because the hard metal wire has elasticity, Although it changes to some extent, it is necessary to greatly reduce bending damage when it hits stone, concrete, etc. Therefore, the winding diameter of this spring portion 3 is increased by providing a spring portion 3 to increase the bending change. , Adjust the winding length Bending degree in mowing blade unit 2 is determined by.
The attachment part 4 is one in which one end of the cutting blade 1 is formed in an annular shape, and the explanation of this attachment method will be described later.

[FIG. 2] is a plan view showing a cutting blade 1 of a mowing blade for a brush cutter according to the present invention and a method of attaching the cutting blade 1, and 5 is a disk-shaped base. The base 5 is a portable small gasoline engine. Rotate at high speed to cut weeds.
A cutting blade insertion plug 6 for attaching the cutting blade 1 is provided inside the base 5. By inserting the attachment portion 4 of the cutting blade 1 into the cutting blade insertion plug 6, the cutting blade 1 can be simplified. Supported by
The number of the cutting blade insertion plugs 6 is in the range of 1 to 50. The number is determined by an efficient number according to the specification content of the cutting blade 1 and the number of rotations.

FIG. 3 is a plan view of the inside of the mowing blade for a brush cutter according to the present invention. A plurality of cutting blade insertion plugs 6 are provided inside the base body 5, and the attachment portion 4 of the cutting blade 1 is provided there. Is inserted, and the blade portion 2 of the cutting blade 1 projects radially outward from the peripheral edge portion 7 of the base body 5.
The spring part 3 is provided inside the base body 5 so as to be bent. Therefore, the blade part 2 bends to some extent when it hits the weed, and further bends when it hits stone or concrete to reduce damage. Since the blade portion 2 of the present invention is a hard metal wire, it does not break like the tip edge of a conventional grass cutting blade, which is a major difference between the grass cutting blade of the present invention and the conventional grass cutting blade.

[FIG. 4] is a side cross-sectional view of a partially cutting blade of a brush cutter for a brush cutter according to the present invention, and a core shaft 10 is provided at the center of the surface of the base 5. 11 is a fastener. The purpose of use of the fastener 11 and the core shaft 10 will be described later.
Reference numeral 9 denotes a cover, which is cut out in the drawing, but is a circular plate. The cover 9 covers and holds the cutting blade 1 housed in the base 5. .
Reference numeral 8 denotes a drive shaft connecting portion provided at the center of the back surface of the base 5, to which a portable small gasoline for driving the grass cutting blade and an engine drive shaft are connected.

  FIG. 5 is a plan view of a cover 9 for covering and closing the contents of the base 5 of the brush cutter for a brush cutter according to the present invention, and a through hole 12 is provided in the center, and a core is formed in the through hole 12. The shaft 10 is inserted.

FIG. 6 is a plan view of the cutter 11 of the brush cutter for a brush cutter according to the present invention, and a screw hole 13 formed in the center of the fastener 11 is provided with a screw.
The fastener 11 is screwed to the core shaft 10 provided at the center of the surface of the base 5 and the cover 9 is fastened. The cutting direction of the thread provided on the fastener 11 and the core shaft 10 is the rotation of the cutting blade. Of course, it is processed in a direction that does not loosen.
In the present invention, a hard metal wire is rotated at a high speed, and weeds are cut by blow by the centrifugal force. Therefore, the life of the cutting blade is long, its price is low, and the user replaces the cutting blade. It is a practical mowing blade that can be repaired easily and quickly and is extremely easy to use.
Of course, the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the spirit of the invention.

Industrial applicability

  Since the weed mowing blade of the present invention is an economical and easy-to-use mowing blade with a long service life, it is superior to each stage in all respects compared to the conventional mowing blade. Yes.

These are the top views of the cutting blade 1 of the mowing blade for brush cutters of this invention. These are the top views which show the coupling | bonding to the base | substrate 5 of the cutting blade 1 of the mowing blade for brush cutters of this invention. FIG. 3 is a plan view of the entire interior of a brush cutter for a brush cutter according to the present invention. FIG. 3 is a side view of a part of the mowing blade for a brush cutter according to the present invention. FIG. 3 is a plan view of a fastener for a brush cutter for a brush cutter according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting blade 2 Blade part 3 Spring part 4 Mounting part 5 Base body 6 Cutting blade insertion plug 7 Peripheral part 8 Drive shaft coupling part 9 Cover 10 Core shaft 11 Fastener 12 Through-hole 13 Screw hole

Claims (2)

  In the mowing blade for a brush cutter, a drive shaft connecting portion is provided at the center of the back surface of the circular base, and a plurality of cutting blade insertion plugs are provided at equal intervals in the center of the surface of the base. One end of a hard metal straight line of 2 mm to 3,0 mm is annularly bent as a mounting part, a predetermined interval is formed in a spring shape from the position of the mounting part, and the other is a straight line and a cutting blade is used as a cutting blade mounting part. A mowing blade for a brush cutter, wherein the blade is inserted into a cutting blade insertion plug, and a straight blade portion is formed radially from the periphery of the base. The mowing blade for a brush cutter according to claim 1, wherein the weeds are cut by weeding a plurality of mowing blades provided radially from a base by rotating at high speed.
Made of hard metal wire

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